Why exactly are you asking? Obviously if you're running a server on your machine, it's accessible via whatever the assigned IP address/hostname is. Is that not working for you?
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Su'Dec 15 '12 at 9:06

I don`t know the details, and only saw someone doing it, so I am posting as a comment. You can plug an android into your PC via USB and use the Chrome developer tools to see elements directly on your phone. No server or wifi needed.
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DallasDec 16 '12 at 20:03

Yes, of course. If your smartphone can connect to your local network over wifi then it can connect to any device on that network (that accepts connections), including your server, just like any other computer can. I do this to keep tabs on mobile compatibility during development, but it is limited to the phones(s)/tablet(s) in your possession so it isn't a very thorough way to test.